Charles a



(No Model.)

0. A. LIEB.

ARMATURHBODY.

N0. 441,246. Patented NOV.Z5, 1890.

WITNESSES:

ATTORNEY ms mmms PETERE cm, wmmmm, wummmm, n. c.

UNITED STATES PATENT OFFICE.

CHARLES A. LIEB, OF NEW YORK, N. Y.

ARMATURE-BOD Y.

SPECIFICATION forming part of Letters Patent No. 441,246, dated November25, 1890. Application filed September 18, 1390. Serial No. 365,561. (Nomodel.)

To all whom it may concern:

Be it known that I, CHARLES A. LIEB, a citizen of the United States, anda resident of New York city, in the county of New York and State of NewYork, have invented certain new and useful Improvements in Armature-?odies, of which the following is a specificaion.

My invention relates to improvements in armature bodies and shafts fordynamo-elec tric machines; and it-consists in the construction,arrangement, and combination of the parts, as hereinafter set forth.

In the drawings the same reference-letters indicate the same parts inall the figures.

Figure 1 illustrates a longitudinal section of the armature-body, itsshaft being shown in elevation. Fig. 2 illustrates an end elevaation ofthe armature-body. Fig. 3 illustrates an elevation, partly in section,of an alternative construction of the stay-rods which are employed tobind the outer portions of the disks together.

A is the shaft.

B is the armature-body. It is composed of disks of metal 0 andinsulating material D, all as usual.

E is a tube, preferably of brass, which is passed or forced through ahole made in all the disks.

The end plates F F of the armature-body are or may be reamed orcountersunk, as at G, and the ends of the brass tube are expanded andforcibly turned back into the reamed-out or countersunk parts, while thedisks are forcibly pressed together. Thus this central tube serves notonly as a box or bushing for the armature-shaft, but it also firmlybinds the disks together and does away with the shoulder and nut both onthe shaft, now usually employed as a means of pressing and holding thedisks together.

11 is an inwardly-projecting annular ring, which is secured either tothe central tube E or to the shaft; or, as I ordinarily prefer, it maybe an integral part of the tube or of the shaft, thus avoiding joints.Its function is to prevent contact of the shaft with the tube, except atits central portion, so that any change of form which thearmature-bodymay undergo will not be transmitted to the shaft, and in this waybending or twisting of the shaft is avoided. Of course the connectionbetween the armature and the shaft through the part H is such that therewill be no slipping.

I do not limit myself to the above-described means of I connecting thearmature and the shaft. It (the shaft) may take a bearing on the tubethroughout, if preferred. Nor do I limit myself to brass as a metalframe from which the tube is to be made. made of any other suitablematerial, being insulated, if desired.

I I, &c., are stay rods or bolts, which pass through the disks betweenthe shaft and their periphery to bind the disks or plates more firmlytogether. These I use especially in large machines. They may be made oftubes, the same as the central tube E, but

preferably smaller, or they may be solid rods.

If of brass, they need not be insulated; but I prefer to make them ofsolid iron rods, as shown at I, Fig. 3. I bore out the ends of the rods,as shown at K K, leaving a relatively thin edge L, which can be readilyexpanded into the countersunk part M of the outer plates or disks in thesame manner that the ends of the central tube or bushing is.

In Fig. 3 I show the solid rod I with one end expanded into thecountersunk hole in the end plate of the armature-body and the other endleft straight, as it appears before expanding.

It is not essential that the holes in the outside plates or disks shouldbe countersunk. I prefer them to be, however. The metal of the tubes orrods may be expanded over onto the flat surface of the plates or disks;but this does not make so finished a job. I also sometimes expand thetubes after insertion in the holes through the disks throughout theirentire length, thus by friction holding each individual metallic disk 0in its proper place, thus preventing shifting or turning thereof. Ifthis construction be employed, it will not always be necessary to expandthe ends of the tubes.

I do not limit myself to the details of construction shown, since theymay be somewhat departed from and still the essentials of my inventionbe employed.

It may be IOC I claim 1. An armature-body comprising, essentially, aseries of disks of iron and insulating material and a tube passingthrough the center thereof, the ends of which are turned over andexpanded against the outermost plates or disks, substantially as setforth.

2. An armature-body comprising, essentially, a series of disks of ironand insulating material, a tube passing through the center thereof, theends of which are turned over or expanded against the outermost platesor disks, and a ring or projection between and connecting the interiorof the tube and the shaft, substantially as set forth. I

3. An armature-body comprising, essentially, a series of disks of ironand insulating material, a tube passing through the center thereof, theends of which are turned over or expanded against the outer plates ordisks, and stay-rods between the central tube and the periphery of thedisks, the ends whereof are also turned overor expanded against theouter plates or disks, substantially as set forth.

4. A11 armature-body having its several disks held together by means ofa centrallydisposed hollow tube, the ends whereof are turned over orexpanded against the outermost plates or disks, substantially as setforth.

5. An armature-body having its several plates or disks held together bystay-rods of solid metal, the ends whereof are turned over or expandedagainst the outermost plates or disks, and a central tube having a ringor projection between and connecting its interior and the shaft,substantially as set forth.

Signed at New York, in the county of New York and State of New York,this 12th day of September, A. D. 1890.

CHARLES A. LIEB.

Witnesses:

PHILLIPS ABBOTT, Fnnnnmcx SMITH.

